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SUMMARY:Superconducting spin valves based on spiral magnets - Dr. Nataliya
  Pugach\, Lomonosov Moscow State University\, Russia
DTSTART:20171122T141500Z
DTEND:20171122T150000Z
UID:TALK95974@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:Superconducting spintronics has emerged in the last decade as 
 a promising new field that seeks to open a new dimension for nanoelectroni
 cs by utilizing the internal spin structure of the superconducting Cooper 
 pair as a new degree of freedom. Currently\, the discipline finds itself a
 t the crossroads for developing first-generation devices. Among the basic 
 units of superconducting spintronics are the so-called superconducting spi
 n valves. These are nanodevices in which the superconducting current is co
 ntrolled through the spin degree by changing the magnetization of magnetic
  elements. We propose a superconducting spin-triplet valve\, which consist
 s of a superconductor and an itinerant magnetic material\, with the magnet
  showing an intrinsic non-collinear order characterized by a wave vector t
 hat may be aligned in a few equivalent preferred directions under the cont
 rol of a weak external magnetic field. Re-orienting the spiral direction a
 llows one to controllably modify long-range spin-triplet superconducting c
 orrelations\, leading to spin-valve switching behaviour. Our results indic
 ate that the spin-valve effect may be noticeable [1]. This bilayer may be 
 used as a magnetic memory element for cryogenic nanoelectronics. It has th
 e following advantages in comparison to superconducting spin valves propos
 ed previously: (i) it contains only one magnetic layer\, which may be more
  easily fabricated and controlled\; (ii) its ground states are separated b
 y a potential barrier\, which solves the “half-select” problem of the 
 addressed switch of memory elements.\n\n[1] N. G. Pugach\, M. Safonchik\, 
 T. Champel\, M. E. Zhitomirsky\, E. Lahderanta\, M. Eschrig\, and C. Lacro
 ix. Appl. Phys. Lett. 111\, 162601 (2017).\n\n
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
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